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JEE Main levelSingle correct optionDifficulty 2 of 3bn132

What is the AVERAGE oxidation number of Fe in $Fe X_{3} O X_{4}$ (O is $- 2$ )?

A $+ 2$
B $+ \frac{8}{3}$
C $+ 3$
D $+ \frac{5}{2}$

Answer: B

3 x + 4 (- 2) = 0

gives

x = 8/3

. This average corresponds to one

Fe X^{2 +}

and two

Fe X^{3 +}

per formula unit.

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